Dudleya candelabrum is endemic to Santa Cruz and Santa Rosa islands; it is considered fairly threatened (California Native Plant Society, http://cnps.web.aplus.net/cgi-bin/inv/inventory.cgi). Among diploids, it seems most similar to the green phase of D. brittonii D. A. Johansen, of coastal northwestern Baja California, which also has a thick, unbranched caudex and large rosettes, and has somewhat similar leaf shape, inflorescence, and flowers. However, D. brittonii has more rosette leaves, which may be farinose or not, longer pedicels that are thickened distally, and conspicuously narrower sepals, with broad U-shaped sinuses.